1. Flashing lights.
2. The music played is probably better than yours.
3. Multiplayer / Social Aspects where you don't have to see the other persons face. Anyone who plays these games is ugly, they don't actually want to go meet other uglies.

That said, with the right sort of game it might be a good idea...
We've all watched movies and been angered by the stupid decision made by one of the characters ('Go reft indy! Go reft! THE REFT TUNNEL!!!!').